Performance Evaluation of a Source-based Video Distribution Strategy for Reservation-based Multimedia Systems

B. Veeravalli and X. Li (Singapore)

Keywords

Network caching, multicast tree, link availability, cachespace, videoonreservation

Abstract

In this paper, we address the problem of minimizing the cost of servicing a set of requests demanding a multimedia document(MMD) in a Video-on-Reservation (VOR) sys tem. In order to provide a guaranteed QoS, generation of multicast trees with end-to-end delay constraint is rec ommended to minimize the costs. Since such a kind of problem in its generic form is NP-complete, we propose a heuristic algorithm, referred to as Source-Based Schedul ing(SBS) algorithm, which judiciously combines the con cept of multicast routing and network caching to solve the problem in polynomial time. As in a real-life situation, we consider constraints such as link availability, cache capac ity, MMD availability at a site, etc, in the problem formu lation explicitly. We testify our design by quantifying the performance on average cost and acceptance ratio with re spect to several influencing parameters through simulation experiments.

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